Environmental Science 15th Edition by Scott Spoolman,Tyler Miller

تمرين 6

What is the key concept for this section? What happens to matter in an ecosystem? What is a nutrient cycle ? Explain how nutrient cycles connect past, present, and future life. Summarize the unique properties of water. Describe the hydrologic cycle , or water cycle. What three major processes are involved in the water cycle? What is surface runoff ? Define groundwater. What is an aquifer ? What percentage of the earth's water supply is available to humans and other species as liquid freshwater? Explain how human activities are affecting the water cycle. Explain how clearing a rain forest can affect local weather and climate. Describe the carbon , nitrogen , phosphorus , and sulfur cycles , and explain how human activities are affecting each cycle.